Improvement in sectional steam-boilers



D A Vl D Improvement in Sectional Y. N o. l2 3, 7 9 3.

R E N S H AW.

Steam` Boil-eps`l` Patented Feb. 2.051372,-

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DAVID RENSHAW, OF SYRAGUSE, NEW YORK.

IMPROVEMENT IN SECTIONAL STEAMfBOlLERS.

Specification of certain Improvements in Steam-Generators, invented by DAVID REN- SHAW, of Syracuse, in the county of Onondaga and State of New York.

Nature and Object of the avcntion.

This invention relates to the construction of Description of the Accompanying Drawing.

Figure l is a front elevation of a generator constructed according to my invention, onehalf of the front or outside shield being removed and the sides of the crown being represented in section to give a clear view of the internal parts. Fig. 2 is a side view ofthe internal parts and base and a section of the top and sides of the crown.

General Description.

A A are the sides, and B B the ends of thel upper portion of a furnace which forms a part of my invention the said'sides and ends forming parts of a reverberatory furnace, being, also, thus made capable of generating steam 3 these sides and ends being cast in whole sections,

secured by stay-bolts a a cast with and forming a part of the same casting as the section to which they belong. The sizes of these sections maybe varied according to circumstances so as to make them easily made and adapted to the convenience of the user, and of sufficient strength to bear safely the strain to which they are to be subjected. The ends B B may be cast in two sections each, joined at the center, as shown in the drawing; or may be divided in smaller sections, according to convenience or preference; but l prefer to make the sides A in sections of about eighteen inches in width, extending from the top down to the large horizontal pipes O. These seetionsA and B should -all be bolted iirmly together where they join eac-h other, and should all connect with each other, particularly at the top, so that the steam generated in all of them can pass to the pipe D, and through it into the steam-drum D., or separate pipes may be carried up from each section to the drinn E. For the purpose of bolting these sections together they should be cast with iianches, as shown at b b; and these iianches should be very exactly iitted and put together with rust or cemented joints on the outside and plain surface-joints on the inside. (l C are large horizontal pipes, cast in a single piece each, and laid across from side to side ot the furnace, as shown, and having heads c at their ends bolted upon them and fitted with plain surface-joints, said heads o being outside of the furnace, so that they can be readily 'removed for the purpose of cleaning the pipes (l. These pipes U are also connected together by the side sections d d, cast in the same piece with them and secured by bolts and suitable plain surface-joints. The said pipes C also have sections or parts j' f east upon them, as shown, to receive the central vertical pipe F and the curved pipes Gr G, all of which may be of east-iron. rIhe pipes F may be cast in one piece with steam-drum E, it' preferred; but I prefer to make them with sections cast with the said steam-drum, extending down just inside of the crown of the furnace, and the portions below, cast separate and secured to them by surface-joints and bolts, so that the main portions of these pipes F may be removed and replaced, if desired, without disturbing the crown of the furnace. The curved pipes Gr G are also attached, by surface-joints and bolts, to theseetions f, as shown, and also to the sections f/ cast upon and forming parts of the pipes F in the same manner. The steam-drum E is provided with gauge-cocks h to determine the height of the water. His the base or lower part of the furnace, which may be made up of cast-metal sections, forming water-legs, which first receive the water pumped in by the suppl y-pump through tl ie feedpipes I, or any one or more ofthem, and from the base H connections may be made with the pipes (l, or one or more of them, to supply them and the pipes connected with them with water by means of pipes J, K, and L, as shown in the drawing.v

L is a blow-oii' pipe attached to the lower part of the base H, and connected also with the pipes C, or one or more of them, by means of the pipe K. The sections which makeup the heat from the tire; and these flues may be rcturned through the upper portion of the water-space, forming the reverberatory arch of the furnace in the position shown by the cap j in Fig. l; or through the base H in the position shown by the cap k in Fig. 2; or any other position may be given to the iiues that may be desirable. l is a feed-openin g between the sections of the base H, and m is a hand-hole for cleaning the base H. 1n the drawing the corners where the front and sides ofthe upper portion ofthefurnace are united are represented asbeingangular; but I prefer to inakcthese corners rounded or curved so as to avoid angles in the castings; and I preferto do this with relation to any other parts of the furnace where curves can be adopted instead of angles. N is the fire-door, and n is the ash-pit of the f'urnace. I recommend the use of a water-pan in the ashpit to clean the grate and for other purposes. It will be observed that the upper part of the furnace is made in the form of a reverberatory furnace, and it will, therefore, to a certain extent, operate in that capacity, While, it being made hollow and supplied with yvater, it will also serve to generate steam. Of course, as a portion ot' the heat is absorbed by it in the generation of steam, that portion of the heat will not be reverberated by it, and it will not be so entirely reverberatory as a furnace of the same form made of non-con ducting material. It may be a question on which good engineers might differ, whether or not for stationary boilers it is desirable to construct a furnace in the manner above described and shown in the drawing, or to construct it of brick; but in locomotive-engines, Where brick is not admissible, this construction Which I have described is of very great advantage, and aids to economize the heat and to make a complete and perfect locomotive steam-generator, which may be entirely of cast-iron (except the necessary bolts) and brought into a very compact form. rIhe furnace portions of the generator, being properly stay-bolted in the manner above described, are very strong, and sufficient strength can thus be secured at moderate cost to safely allow a much higher working pressure than boilers, as generally constructed, whether of cast or wrought iron, can safely carry. It will bc observed that, as the stay-bolts are cast with and form a part ot' the single casting of which each section is made, their number can be cheaply increased, and they are cast in With a very little additional labor.

rlhe combination of the cross-pipes C, the central vertical pipes F, the curved pipes G, and the steam-drum E inclosed in a proper fun nace, and especiallyin one having reverberatory power, results in many important advantages, among Which may be mentioned that it secures the most satisfactory and stable bearing of the evaporating parts on the. supports in la locomotive-engine of any boiler which has yet been produced. It furnishes a more compact boiler in proportion to its Workin g capacity than is produced by the ordinary constructions. It secures an excellent circulation of the Water-an extraordinary economy in evaporation while, at the same time, a steam-generator constructed in this way is very safe, and caa be constructed at moderate cost.

The combination, with the horizontal pipes G extending across over the fire, of the central vertical pipe F, connecting directly with the cross-pipes G and the covered pipes G, also connecting at intervals directly with the said crosspipes C and with the vertical pipes F, is of very important advantage, and produces a circulation of the water which Would not be realized by an indirect connection of the curved pipes G with the ends of the horizontal or cross pipes C.

The combination of the heads c or their equivalent with the cross-pipes C, the vertical pipes F, and the curved pipes G is very important, as the construction ot' the pipes F and G and their combination with the pipes G is such that the sediment formed in said pipes` F and G is discharged into the pipes C 5 and, by oombining therewith the removable heads c, this sediment, which is formed in all parts of this internal boiler, can be readily removed and the boiler kept in good Working condition.

Claims.

ber of them being cast in a single piece of each i and stay-bolted, substantially as hereinbet'ore set forth.

2. rIhe combination of a fire-chamber or furnace made up of sections, such sections or any number of th ein bein gcast in a single piece each and stay-bolted, with steam-generating apparatus contained wit-hin said furnace, substantially as hereinbefore set forth.

3. The combination of the horizontal crosspipes C, the vertical pipes F, connecting dircctly with the pipes C, and the pipes G, also connecting directly with the pipes C at their lower ends, and With the pipes F at their upper ends, substantially as hereinbefore set forth.

4. The combination of the horizontal crosspipes O, the vertical pipes F, connecting directly with the cross-pipes C, the pipes G also connecting directly at intervals With the crosspipes C and the steam-drum E, substantially as hereinbefore set forth.

5. The combination of the horizontal crosspipes C, the vertical pipes F connecting directly with the said pipes C, the pipes G also connecting directly with the said pipes C at their' lower ends and with the pipes F at their upper ends, and the removable heads e attached to the ends of the horizontal pipes C, snbstantially as hereinbefore set forth.

DAVID RENSHAW. Vitnesses:

Trios. P. HOW, ANNA M. Non'rnnor. 

